Transverse t-square device



Sept. 21, 1937. I J. SHULKIN 8 TRANSVERSE T- SQUARE DEVICE Filed Oct. 28, 1955 Patented Sept. 21, 1937 Z,@93,7&3

UNITED STATES PATENT OFFIQE TRANSVERSE T-SQUARE DEVICE Joseph Shulkin, Sioux City, Iowa Application October 28, 1935, Serial No. 47,128

2 Claims. (01. 33-46) My invention relates to a T-square device extends throughout the length of the member as usable for drafting or other purposes. shown.

An object of my invention is to provide a pair A further T-square member 22 is received beof T-squares which can be at right angles to each tween the main body I3 of the other T-square and 5 other. the strip I6, and is slidably movable at right 5 A further object of my invention is to provide angles thereto. The T-square 22 also includes a means for locating desired points conveniently groove 23, which groove receives a further scale using one of the T-square edges as a base without 24, which is slidable and movable therein. It will the necessity of mental computations and the be noted that the grooves receiving the small like. scale slides are so made that the slides cannot be 10 A further object of my invention is to provide displaced therefrom (see Figures 2 and 3). The means for fixing either of the T-squares to proslide 26 also includes the small openings 25 at vide a rigid base member if such is necessary. either end for the purpose above mentioned.

A further object of my invention is to provide The T-square 22 has strips 26 and 21 (see Figures means for allowing positioning of the T-squares 1 and 3) attached at the inner and outer ends so 15 as close to the edge as possible. that the base member 22 itself will be positioned A further object of my invention is to provide at the same level throughout. The T-square 22 all of the above mentioned objects in a structure includes the head 28, which head terminates at of great simplicity which can be manufactured the division 29, and a further portion of the head at a very reasonable cost. 30 is pivotally secured to the head 29 by means 20 With these and other objects in view, my inof the hinge 3!, so that the portion 33 can be vention consists in the construction, arrangeswung downwardly if desired. The reason for ment and combination of the various parts of my this construction is that when the inner edge device, whereby the objects contemplated are such as 32 is brought up against the left hand side attained, as hereinafter more fully set forth, of the drafting board I 0, and in case the head it 5 pointed out in my claims, and illustrated in the of the T-square I3 would be in the lower left hand accompanying drawing, in which: corner as shown in Figure 1, this would eliminate Figure 1 is a plan view showing the device as the portion from abutting against the head M, used, since the portion 30 would be turned downwardly, 30 Figure 2 is a sectional view of Figure 1 taken and suitable lines could then be drawn in the 30 along the lines 22 thereof, lower left hand corner without restriction.

Figure 3 is a sectional view taken along the To retain the d 23 and the portion 39 lines 3-3 of Figure 1 thereof, rigidly when such collapsing is not necessary, I Figure 4 is an enlarged detail, and provide the small spring element 33 which is 35 Figure 5 is an enlarged detail of the pivotal T- pivoted at 24. T is el me t is he d in t e po 35 square head. tion shown by the solid lines in Figure 5 in or- I have used the character In to designate genn ry but w i is desired to win he erally a drafting board having the sides II and I2. member 33 downwardly, the member 33 is piv- One of the T-squares of my device is indicated by oted to the dotted position.

the character I3, and the head of the T-square Each T-square also includes a small portion 40 by the character I4. The member I3 is provided Such as at 34 with a separate Scale for marginswith a bevelled edge I5 having suitable indicia The end of each T-square includes the small thereon for measuring and the like. The T- openings 35 so that if it is desired to firmly sesquare member I3 also includes the raised strip cure one of the T-square members to the board,

45 I6 which is supported by the member I1, and the small thumb tacks such as 36 can be placed strip enters the head I4 at I8. The T-square therein and into the board, thus providing a firm member I3 also includes the lengthened groove foundation, so that one T-sq Will not become I9, which groove is adapted to receive the slidable displaced during movement of the other. scale 20. The scale 20 also carries suitable mark- As shown in Figure 1, the horizontal T-square ings along the edge thereof, starting at a convenwill be rigidly attached to the board without fear 50 ient zero point and progressing in fractions of an of distortive movement. It will be seen from this inch or in any other suitable manner. I further structure that lines can be drawn at right angles provide small holes 2| at either end of the sliding to each other, and that any one of the T-squares V scale 20 so that apoint can be inserted therein for can be used as a base, and points set off from 55 convenient movement thereof. The groove I9 the edge thereof by simply moving the slidable scales or 24. I find this especially suitable in many types of drafting work and also in composition or lay out work for printing establishments. The zero point of either scale can be placed at the edge of one of the T-squares, and the next or several points set without the necessity of mental addition of complex fractions and the like. Also this device provides means for securing measurements directly without the necessity of additional scales, etc. Many other advantages apparent from the construction will be seen, which render the device extremely useful for the purposes intended.

It will now be seen that I have provided a T- square device which is readily adjustable, and which provides means for using two T-squares at right angles to each other for various necessary purposes as well as obtaining measurements along the same.

It will also be seen that I have provided means for fixing either of the movable members rigidly to prevent displacement, and that I have provided means for positioning the T-squares close to each other without interference.

It will also be seen that I have provided all of the above mentioned constructions in a structure of great simplicity which can be manufactured at a very reasonable cost.

Some changes may be made in the construction and arrangement of the parts of my invention without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents, which may be reasonably included within their scope.

I claim as my invention:

1. A drafting tool comprising a main T-square including a strip spaced therefrom, a further T-square received between the strip and the main T-square, said further T-square arranged at right angles to the main T-square and adapted to slide between said strip and said main T-square, measuring scales slidably received within each T- square for measuring distances along the same.

2. A drafting tool comprising a main T-square including a strip spaced therefrom, a further T-square received between the strip and the main T-square, said further T-square arranged at right angles to the main T-square and adapted to slide between said strip and said main T-square, measuring scales slidably received within each T- square for measuring distances along the same, said further T-square including a hinged head portion adapted to swing downwardly from the head.

JOSEPH SHULKIN. 

